class_docstr: Object representing a set of rows by keeping a list of RowKeys and
  RowRanges that the set consists of.
code: def __init__(self, impl):
      self._impl = impl
  
file_path: io/tensorflow_io/python/ops/bigtable/bigtable_row_set.py
imports: from tensorflow_io.python.ops import core_ops
  from tensorflow_io.python.ops.bigtable import bigtable_row_range
  from typing import Union
label_desc: Use image node_id 1 to create a new RowSet object  with example: obj = RowSet(impl)